OCR Text |
Show 56 when the station was occupied by the astronomer. As far as can be learned from the diary, the nights were pretty clear, and the condition of the air very favorable for astronomical observations. In 1872 some barometric observations were taken to determine the altitude of the place. The astronomical observations were taken iu a common wail- tent, as at the other stations. Mr. A. li. Marvine, the observer, was assisted by a recorder and two soldiers, and Mr. E. P. Austin had charge of the Salt Lake observatory, the use of which was kindly tendered by President Brigham Young, of the Mormon church. Through him the use of the Deseret Telegraph line, for exchange of signals, was secured. The wires were brought into the tent by a loop. The astronomical instruments used at St. George were the combined transit, used before by Assistant E. P. Austin, in Nevada, and the sidereal chronometer, Negus No. 1344. The Salt Lake instrument belonged to President Young, and was used by a Coast- Survey party, and by the expeditions of 1872 and 1873. Ail the data relating to this instrument will be found in the general report for 1S73 by J. II. Clark. Hutton mean- tidie chronometer No. 288 was used for the determina-t'on of time. All the observations were taken bjT eye and ear, and the exchange of signals made by souud. Connection was made, as stated, with Salt Lake observatory. Exchanges of signals were effected on the nights of September 13, 14, and 15, 1871. The observations at both stations were compared in 1873 by Dr. F. Kampf, aud rereduced in 1874, when this report was made up by him. The instrumental values for the St. George instruments will be found in the Carliu report, and those for the Salt Lake transit in J. II. Clark's general report for 1873. The telegraphic line is three hundred miles long, and the signals were transferred direct, without repeaters. The discrepancy between the results for longitude on the first and second days is very remarkable, but too large on the secoud day to take into the final result. It may be that this change is an example of rapid variation in personal equation. Salt Lake City, September 13, 1871. Name of star. t Lyrce 0 Lyr ® 50 Dracoujg. C Aquila*.. 6 Draonnis. 6 Aquili ® .. K Aquilte .. Aquila*.. t DraconU. W. 1 I 54 6 12 21 34 40 51 1 10 12.09 56.94 9.50 6.88 9.65 37.59 35.09 45.70 Mean for 7V 5369 Hu1t 4to. 6n4' s time 6B 0. - 0 . 33 - 0 . 96 - 0 . 65 - 0 . 2 2 - 0 . 40 - 0 . 17 - 0 . 15 - 0 . 20 - 0 . 34 aA 8. 0.00 + 0.02 - 0 . 28 + 0.06 - 0 . 15 + 0.08 4 0.09 + 0.07 - 0 . 18 1 « C • T » . i h. m. 8. + 0.02 6 54 11.78 + 0.02 ' 7 6 56. 72 + 0.06 12 A 63 -^ 0.02 21 6.74 + 0.04 ! 34 9.14 - 0 . 0 2 i 40 37.48 - 0 . 0 2 51 35.01 - 0 . 0 2 | 8 1 45.55 - 0 . 05 10 14.07 AR. h. m. 18 32 45 50 59 19 12 19 29 40 48 8. 35.48 20.37 32.36 30.33 32.64 1.31 53.86 9.35 37. e4 h. + 11 4 11 + U AT m. 8. 38 23.70 23.65 23.73 23.5!# 23. 50 23. 83 23.85 23.80 38 23.77 38 23.713 Normal equations. 0 ^ + 0.12 + 9.00< J* - 1.25 a - 4.10 c Jf= + o-, 013 0 - - 1.35 - 1. 25 6 t - 4- 9. 79 a + 8. 84 e a - + 0*. 125 0 = - 1.66 - 4.10 6 t t b. 84 a ~ 3s. 01 e $ = - 0\ 016 |